<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        a {
            font-size: larger;
        }
        
        button {
            background-color: darkcyan;
        }
        
        ul {
            width: 150px;
            background-color: cornflowerblue;
        }
        
        #parent {
            width: 150px;
            height: 50px;
            background-color: cadetblue;
        }
        
        #child {
            width: 75px;
            height: 25px;
            background-color: darkkhaki;
        }
    </style>
    <script src="./demo11.js"></script>
</head>

<body>
    <div id="parent">
        Parent div
        <div id="child">
            Child div
        </div>
    </div>
    <div>
        <ul>
            <button>
                    <li>小白巧拿铁</li>
                </button>
            <button>
                    <li>陨石厚乳拿铁</li>
                </button>
            <br>
            <button>
                    <li>生椰拿铁</li>
                </button>
            <br>
            <button>
                    <li>小黄油拿铁</li>
                </button>
            <br>
        </ul>
    </div>
    <button>
            <span><a href="https://www.baidu.com/">click me </a></span>
        </button>

</body>

</html>